Income Taxes - Domestic and Foreign Income (loss) before income taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Domestic and Foreign Income (Loss) before Income Taxes and income (loss) in equity method investments. [Line Items]
Loss before income taxes and equity in earnings of joint venture	$ (15,542)	$ (14,613)	$ (14,326)
U.S.
Domestic and Foreign Income (Loss) before Income Taxes and income (loss) in equity method investments. [Line Items]
Loss before income taxes and equity in earnings of joint venture	(28,398)	(26,321)	(19,420)
Non-U.S.
Domestic and Foreign Income (Loss) before Income Taxes and income (loss) in equity method investments. [Line Items]
Loss before income taxes and equity in earnings of joint venture	$ 12,856	$ 11,708	$ 5,094